Hot-air eubnace



S. DANIELS.

HOT AIR FURNACE.

APPLlCATlON FILED m-mzo, 191s.

Patented Aug. 1, 1916.

4 SHEETSSHEET 1.

S. DANIELS.

HOT AIR FURNACE.

APPLICATION FILED JAN-20,1916- l 1 93., 1 27.. Patented Aug. 1, 1916.

4 SHEETS-SHEET 2.

S. DANIELS.

HOT AIR FURNACE.

APPLICATION FILED JAN-20.1916.

L l 93., 1 2? Patented Aug. 1, 1916.

4 SHEETS-SHEET 3- :7 i I S. DANIELS.

HUT AIR FURNACE.

APPLICATION FILED JAN-20. IQIG. Ll 93,1%?', Patented Aug. 1,1916.

4 SHEETS-SHEET 4.

,HLHIJ MI! WMMM 1' B 054W SAMUEL DANIELS, OF'I-IARDVJIGK, VERMONT.

nor-Ara FURNACE.

wearer.

Specification of Letters Patent.

Patented Aug. 1, 1916.

Application filed January 20, 1916. Serial No. 73,221.

To all whom it may concern Be it known that I, SAMUEL DANIELS, a citizen ofthe United States, residing at Hardwick, in the county of Caledonia and State of Vermont, have invented certain new and useful Improvements in Hot-Air Furnaces; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention which relates to improvements in hot air furnaces has for its object to provide a simply constructed and ineX-. pensive apparatus of this class which may tially disassembled; Fig. 3 is a top plan' view with the top of the. furnace shell re moved; Fig. 4 1s a bottom plan view; Flg. 5 is a longitudinal vertical section as seen on the plane indicated by the line 5-5 of Fig. 8; Fig. 6 is substantially a central vertical longitudinal section; Figs. 7 and 8 are vertical transverse sections taken on the I planes of the lines 7-7 and 8-8 of Fig.

5; Fig. 9 is a perspective view of the removable air heating drums; Fig. 10 is a perspec tive detail of one of the front corners of the shell 8; Fig. 11 is a similar view of one of the rear corners thereof.

ltn specifically describing the construction shown in the drawings above briefly described, similar characters will be placed on corresponding parts throughout the several views and reference will be herein made to the numerous elements by their respective indices. To this end, thenumeral 1 designates a rectangular base frame consisting of parallel side bars 2 formed of angle iron L-shape in cross section, a rear bar 3 formed of similar material, and a front bar 4- also formed thereof. As shown clearly in Figs 5, 6 and 10, one flange of the bar 4 overlies and is secured to the horizontal flanges of the side bars 2, while the other flange of said bar 4 depends from said first named flange and serves as an anchor to be embedded in the base of cement or the like upon which the entire furnace rests.

Secured by bolts or the like to the upstanding flanges of the side bars 2, are the lower edges of the side walls 5 of the furnace shell, said lower edges being preferably bent inwardly as shown at 6 to provide horizontal flanges underlying an appropriate lining 7 with which the shell is equipped, said lining preferably consisting of asbestos and corrugated sheet metal as shown. The rear ends of the sheet metal side walls 5 are extended beyondthe corners of the frame 1 and are here secured by bolts or the like 8 to rearwardly extending upright flanges 9 bent laterally from the rear wall 10 of the shell, channel iron bars or the like 11 being passed over said flanges and the rear ends of the sides 5 as shown in Figs. 3, 10 and 11, whereby to effectively retain these parts in contact by the use of a comparatively small number of bolts, the latter being passed through the bars 11 as well as through the parts above mentioned.

For the purpose of establishing connection more nearly air tight than would otherwise be possible, horizontally disposed sheet metal strips 12 are secured to the lower edge portions of the walls 5 and 10, the lower edges of said strips being offset outwardly and contacting with the outer sides of the bars 2 and 3.

The front end of. the furnace shell consists of a horizontally elongated rectangular section 13 spaced upwardly from the bottom of the shell and having forwardly extending flanges 14 on its upright edges, said flanges being disposed in contact with the front edges of the side walls 5, which edges and flanges are received 111 upright channel iron bars or the like 15, bolts 16 belng passed 3 through all of these parts. Extending from the front bar 1 of the frame 1 to the end portions of the section 13, are two vertically elongated rectangular sections 17 having flanges 18 on their four sides. One of these flanges of each section 17 is disposed in contact with the inner side of the front end of the side walls 5, being secured in this position by channel iron bars 15 and bolts 16 identical with the parts 15 and 16 above described.

The lower flanges of the sections 17 are secured detachably by bolts 19 to the bar 4, whilelthe upper flanges thereof contact with the lower sides of a horizontal fiange 20 projecting forwardly from the lower edge of the section 13, being held in this position by a channel iron 15 and bolts 15.

. As shown clearly in several figures of the drawings, the upper edges of the side, the front andthe rear walls of the shell are bent first downwardly and then upwardly to providechannels 21, said channels receiving therein the lower edge of an appropriate rectangularhood 22' which constitutes the top of the shell, said hood being equipped with any preferred style and number of outlets 23 through which air heated by the furnace proper yet to be described is'discharged, fresh air being admitted into the casing through an appropriate inlet such as that shown at 24:.

Fitting snugly between the innermost flanges 18 of the two front end sections 17 and between the bar and the intermediate portion of the flange 20, is a rectangular casting or the like 25 having appropriate fuel, ash and draft doors. The casting 25 I constitutes the frontend of an elongated horizontally disposed fire boX 26 whose lower corners rest'within the angles of a pair of L-iron tracks 27, the front ends of said tracks being supported on and secured to the bar 4, while the rear ends thereof are secured upon the bar 3. The fire boX 26 is spaced from the sides and rear end of the shell, whereby to allow for the circulation of air around the former to effectively heat such air before being discharged through theoutlets 23.

Disposed in the upper portion of the shell are two parallel horizontally spaced horizontally elongated heating drums 28 preferably of rectangular formation, said drums being in communication at one end through a tube 29 secured thereto.

One drum 28 is provided with a depending smoke inlet tube 30 in its bottom, while the rear end of the other drum is equipped with a smoke outlet pipe 31 which projects horizontally through an opening 32 in the rear wall 10 of the shell, being slidably and detachably engaged with an appropriate smoke pipe 33. As shown most clearly in Figs. 5 and 8, thetubular smoke inlet 30 is telescopically and detachably engaged with a smoke outlet thimble or the like 34: which rises from the top of the fire box 26.

Resting removably on the upper end of the fire boX 26 is a transversely disposed horizontal bar 35 having its opposite ends bent upwardly at 36 and secured in any preferred manner to the bottoms of the drums 28 at one end of the latter, whereby to effectively support said end and at the same time to rigidly brace the two drums in respect to each other (see Figs. 2, 8 and 9). The upwardly bent ends of the bar 35 abut rigid stops 37 secured to and rising from the top of the fire box 26, whereby the drums are held against shifting and thus retained in operative position.

Positioned beneath the opposite end of one drum is an additional horizontal bar 38 whose opposite ends are bent upwardly at 39 and secured to said drum, one of said ends being extended laterally as shown at 4-0 and secured to the other drum, whereby to still further brace the two in respect to each other. The effect of the bars 35 and 1-0, that is in respect to the two drums 28, is increased by one or more metal straps 41 which are secured to and rigidly connect the upper sides of said drmns (see Figs. 3 and 7).

For the purpose of allowing the drums 28 to be cleaned when necessary, a cleaning pipe 42 preferably extends rearwardly from one of the drums 28 and projects slidably and removably through an opening in the rear end of the shell, said pipe being normally closed by a plug or the like d3.

In order to direct the air within the shell against the sides of the drums 28. vhich latter are heated by the passage of smoke therethrough, a pair of longitudinally disposed upwardly and inwardly inclining defiecting plates it are preferably used, said plates being secured to the sides of the shell as depicted clearly in Figs. 7 and 8.

Completing the structure of the improved furnace, is a pair of rigid retaining fingers 45 whose front ends overlie a flange 16 which projects rearwardly from the fire box 26, the rear ends of said fingers being riveted or otherwise secured to the two angle metal tracks 27 (see in particular Figs. 1, 6 and 7).

By constructing the apparatus in the manner above described, it will be an eiiicient heater, yet when desired, the entire front end of the shell may be removed, whereupon the fire boX 26 and the two drums 28 may be withdrawn from said shell as a unit. Furthermore, by now lifting the drums, they may be totally detached from the fire box. This allows not only the drums and fire box to be cleaned thoroughly, but renders the interior of the shell accessible to allow it also to be cleaned. When reassembling the numerous parts of the furnace, the thimble 34 will cooperate with the tube 30 and the stops 37 will coact with the ends of the bar 35 to hold the drums in operative position upon the fire box. When now, the latter and said drums are moved into the shell upon the tracks 27 the inward movement of these parts will be limited by the fingers 45 which will retain them in operative position. Furthermore, due to the arrangement of parts shown and described, the smoke outlet pipe 31 and the cleaning pipe 42 will pass freely into their respective openings. When now, the front of the shell is again applied, the apparatusis ready for continued use.

From the foregoing, taken in connection with the accompanying illustration, the construction, manner of operation and numerous advantages of the improved furnace will be readily understood without requiring a more extended explanation. In conclusion, however, I wish to state that although certain specific details have been shown and described for illustrative purposes, numerous changes may be made with in the scope of the invention as claimed without sacrificing any of the primary advantages thereof. l

I claim 1. A furnace comprising an elongated rectangular shell having a fresh air inlet and a hot air outlet, the rear end of said shell being formed with an opening near the upper end thereof, an elongated rectangular fire box disposed in the lower portion of said shell and spaced from the sides and rear end thereof, a removable front Wall for the shell whereby the fire box may be re moved, a pair of horizontally spaced horizontally alined parallel drums disposed in the upper portion of the shell, said drums being in communication, supports secured to said drums and resting on the top of the fire box, a smoke inlet in the bottom of one drum, a smoke outlet pipe leading horizontally from the rear end of the other drum and slidably received in the aforesaid opening in the shell, and a smoke outlet from the fire box telescopically and detachably engaged with the aforesaid smoke inlet.

2. A furnace comprising an elongated rectangular shell having a fresh air inlet and a hot air outlet, an elongated rectangular fire box disposed in the lower portion of said shell and spaced from the sides and rear end thereof, a removable front wall for the shell whereby the fire box may be removed, a pair of horizontally spaced horizontal elongated parallel drums disposed in the upper portion of the shell and communicating one with the other, supports secured to said drums and resting on the top of the fire box, fixed stops on the latter cooperating with said supports to retain the drum in operative position, a smoke inlet in the bottom of one drum, a smoke outlet from the other drum, and a smoke inlet from the fire box telescopically and detachably engaged with the first named smoke inlet.

3. A furnace comprising an elongated rectangular shell having a fresh air inlet and a hot air outlet, an elongated rectangular fire box disposed in the lower portion of said shell and spaced from the sides and rear end thereof, a removable front wall for the shell whereby the fire box may be removed, a pair of horizontally spaced horizontally elongated parallel drums disposed in the upper portion of the shell, said drums communicating one with the other, a smoke inlet in the bottom-of one drum, a smoke out let from the top of the fire box telescopically and detachably engaged with said inlet, a smoke outlet from the other drum, a transverse bar resting on said top of the fire box beneath one end of the drums and having its ends bent upwardly and secured to said drums to form supports therefor and at the same time to brace said drums in respect to each other, and fixed stops rising from said top of the fire box and abutting said upwardly bent ends of the bar to retain the drums in operative position.

l. A furnace comprising an elongated rectangular shell having a fresh air inlet and a hot air outlet, an elongated rectangular fire box disposed in the lower portion of said shell and spaced from the sides and rear end thereof, a removable front wall for the shell whereby the fire box may be removed, a pair of horizontally spaced horizontally elongated parallel drums disposed in the upper portion of the shell, said drums communicating one with the other, a smoke inlet in the bottom of one drum, a smoke outlet from the top of the fire box telescopically and detachably engaged with said inlet, a smoke outlet from the other drum, a transverse bar resting on said top of the fire box beneath one end of the drums and hav ing its ends bent upwardly and secured to said drums to form supports therefor and at the same time to brace said drums in respect to each other, a second horizontal bar resting on said top of the fire box beneath the other end of said drums and having its ends bent upwardly and secured to one drum, one of said ends being extended laterally and secured to the other drum to further brace the two drums in respect to each. other, and fixed stops rising from the top of the fire box and abutting the upwardly bent ends of one of said bars to retain the two drums in operative position.

5. A furnace comprising a shell having a fresh air inlet and a hot air outlet, a horizontally disposed rectangular frame to which the lower end of said shell is secured, a pair of parallel lL-iron bars secured at their front and rear ends to the front and rear bars of said frame between the ends of said last named bars, the upright flanges of said L-iron bars being disposed on and rising from the remote edges of the horizontal flanges thereof, an air heater having a lower end of rectangular formation resting slidably on said horizontal flanges and received sildably between said upright flanges of the L-iron bars, and a removable front end for the shell whereby the heater may be withdrawn therefrom.

6. A furnace comprising a shell having a fresh air inlet and a hot air outlet, a horizontally disposed rectangular frame to which the lower end of said shell is secured, a pair ofparallel L-iron bars secured at their front and rear ends to the frontand rear bars of said frame between the ends of said last named bars, the upright flanges of said L-iron bars being disposed on and rising from the remote edges of the horizontal flanges thereof, an air heater having alower end of rectangular formation resting slidably on said horizontal flanges and received slidably between said upright flanges of the L-iron bars, a rearwardly extending horizontal flange on the rear end of the heater at its lower extremity, a pair of retaining fingers secured at their rear ends to the L-iron bars, the front ends of said fingers overlying the last named flange to retain the heater in operative position, and a removable front end for the shell whereby said heater may be Withdrawn therefrom.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

SAMUEL DANIELS.

Witnesses:

OSCAR L. SHEPARD, BERNARD J. MALCOLM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

7 Washington, D. G. 

